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The effect of fishmeal supplementation of a straw-based diet on growth and calorimetric efficiency of growth in heifers

Published online by Cambridge University Press:  09 March 2007

Isabelle Ortigues
Affiliation:
AFRC Institute for Grassland and Animal Production, Shinfield, Reading, Berkshire RG2 9AQ
T. Smith
Affiliation:
AFRC Institute for Grassland and Animal Production, Shinfield, Reading, Berkshire RG2 9AQ
M. Gill
Affiliation:
AFRC Institute for Grassland and Animal Production, Hurley, Maidenhead, Berkshire SL6 5LR
S. B. Cammell
Affiliation:
AFRC Institute for Grassland and Animal Production, Hurley, Maidenhead, Berkshire SL6 5LR
N. W. Yarrow
Affiliation:
AFRC Institute for Grassland and Animal Production, Shinfield, Reading, Berkshire RG2 9AQ
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Abstract

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Thirty-two 160 kg dairy heifers were used to measure the effects of increasing dietary protein content on growth and heat production. A basal diet containing (g/kg) 550 sodium hydroxide-treated straw, 220 barley, 220 sugarbeet pulp and 10 urea was offered with 0, 76 and 152 g fishmeal/kg dry matter of the basal diet (F0, F1 and F2 levels respectively). The three diets were each given at two levels of feeding (low, L; high, H): 57.6 g/d per kg metabolic body-weight (W0.75) for the LF0 diet and 74.7 g/d per kg W0.75 for the HFO diet. Apparent digestibility of the diets increased in response to the addition of fishmeal. Mean dry matter digestibility values were 0.67, 0.67, 0.69, 0.66, 0.68 and 0.69 and those for acid-detergent fibre digestibility were 0.60, 0.63, 0.66, 0.58, 0.60 and 0.65 for diets LF0, LF1, LF2, HF0, HF1 and HF2 respectively. Nitrogen retention increased in response to both fishmeal and feeding level. Live-weight gains were 170, 296, 434 g/d for the LF0, LF1 and LF2 diets and 468, 651 and 710 g/d for the HF0, HF1 and HF2 diets respectively. There were significant effects of increasing the plane of feeding and the level of fishmeal in the diet on live-weight gain. Dietary effects on live-weight gains were accompanied by increases in mean energy retention of 23, 45, 82, 94, 160 and 152 kJ/d per kg W0.75 for diets LF0, LF1, LF2, HF0, HF1 and HF2 respectively, but no definite evidence was obtained that dietary supplementation with fishmeal modified the efficiency of utilization of metabolizable energy for growth.

Type
Energy and Protein Metabolism
Copyright
Copyright © The Nutrition Society 1990

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